There is a Text explanation for both of those formations
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Reserve Company*
*
Reserves are organized into two classes--Reserve I and Reserve II. The first category includes all men under age thirty-five who are not serving in the NVA, former company grade officers and NCOs under age thirty-five, and former field grade officers under age sixty. The second reserve category includes former company grade officers between ages thirty-five and sixty, former NCOs between ages thirty-five and fifty (in certain cases to age sixty), and all other men between ages thirty-five and fifty who have not served in the Nationale Volksarmee (NVA). The main reserve group is Reserve I, which reinforces combat units. Reserve II, which would probably only be activated in event of total mobilization, is charged with reinforcing units of the rear services. In 1987 the total size of the reserve was estimated to be 400,000.
Reserve II Company*
*
Reserves are organized into two classes--Reserve I and Reserve II. The first category includes all men under age thirty-five who are not serving in the NVA, former company grade officers and NCOs under age thirty-five, and former field grade officers under age sixty. The second reserve category includes former company grade officers between ages thirty-five and sixty, former NCOs between ages thirty-five and fifty (in certain cases to age sixty), and all other men between ages thirty-five and fifty who have not served in the Nationale Volksarmee (NVA). The main reserve group is Reserve I, which reinforces combat units. Reserve II, which would probably only be activated in event of total mobilization, is charged with reinforcing units of the rear services. In 1987 the total size of the reserve was estimated to be 400,000.